Shielded Speaker Wire 12AWG

Have you researched using shielded speaker cables?

Here’s one guys opinion on shielded speaker cables.

https://www.youtube.com/watch?v=961LaW8xVd4   

That was informative, I didn't mention that I am running balanced XLR cables between the pre amp and amp. I'll need to research whether shielded speaker wires will improve my listening experience. Thanks for your input.

I’m a bit confused about your question. Generally, systems put together for high fidelity will be interconnected with speaker cables... built to sound good as opposed just some off the shelf wire with a material requirement. 

Since it sounds like you have a home theater... guessing now... from which you also listen to music. Then you should invest in speaker cables made for the purpose. I recommend looking into Cardas and DHLabs speaker cables. 

For me, I have pretty good quality speaker cables attached to the front three channels and then, the same brand, but lower quality bulk cable for the other channels. 

Given the sonic characteristics of the Marantz and Focal, I recommend looking at Cardas. But ether of these are likely to improve the sonic characteristics of your system for music. It may also be very obvious for HT. But HT is generally less important because one is distracted by the video. But if you are comparing to really cheap wire... then you will probably find it a noticeable improvement. 

From my limited listening experience, other than coax cables used from a TT to a phono preamp, shielded cables can suck the air, the life, out of the sound of the music. That’s even been my experience with shielded power cords.

There are other ways to control EMI other than using a shield. Twisting the wires together. Braiding the wires together. Just to name two methods.

It can be quite complex...

One example:

Iconoclast Cable. The "Wire we Here?"